G1800S rear wheel interferes contacts rear gauge wheel on hard right turn

[kb5won]

My 4-wheel-steer G1800S seems to have a setup issue. On hard right turns, the right rear wheel rubs on the right rear deck wheel. I don't have an owner's manual for it yet (on order), so I'm wondering if there is a setup procedure for the deck? I was thinking about trying to shorten the front link some, but it looks like it is already adjusted about as short as it can go.

It only rubs when the deck is down, no interference issue with the deck is raised up.

The rear axle is bolted to the frame, I don't see any adjustment potential there, so I'm thinking the only adjustments I can make are in the deck.

Any wisdom here? Does the owner's manual cover how to set it up correctly?

 

[kb5won]

UPDATE: I wound up cutting the right deck wheel bracket up and fabbing a dogleg to push the wheel out by 1-1/2". That seems to have fixed the interference issue. I started to buy a new bracket because I suspected I had the wrong one, but Kubota has obsoleted that part.